As an important kind of organic acid, lactic acid is widely used in industries of food, beverage, brewing, spice, medicine, leather, cigarette, chemical engineering as well as printing and dyeing. As the application areas of lactic acid and its derivatives expand and the consumption increases, demand for lactic acid keeps increasing in China. Lactic acid is also widely used as pH modifying agent in beer. Demand for lactic acid continues to increase in food industry.